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    <section id='main' class="content"><pre class="line-numbers"><span id="1">   1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="doccomment">//! A lightweight logging facade.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A logging facade provides a single logging API that abstracts over the</span>
<span class="doccomment">//! actual logging implementation. Libraries can use the logging API provided</span>
<span class="doccomment">//! by this crate, and the consumer of those libraries can choose the logging</span>
<span class="doccomment">//! framework that is most suitable for its use case.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If no logging implementation is selected, the facade falls back to a &quot;noop&quot;</span>
<span class="doccomment">//! implementation that ignores all log messages. The overhead in this case</span>
<span class="doccomment">//! is very small - just an integer load, comparison and jump.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A log request consists of a target, a level, and a body. A target is a</span>
<span class="doccomment">//! string which defaults to the module path of the location of the log</span>
<span class="doccomment">//! request, though that default may be overridden. Logger implementations</span>
<span class="doccomment">//! typically use the target to filter requests based on some user</span>
<span class="doccomment">//! configuration.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Use</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## In libraries</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Libraries should link only to the `log` crate, and use the provided</span>
<span class="doccomment">//! macros to log whatever information will be useful to downstream consumers.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # #![allow(unstable)]</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate log;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # #[derive(Debug)] pub struct Yak(String);</span>
<span class="doccomment">//! # impl Yak { fn shave(&amp;self, _: u32) {} }</span>
<span class="doccomment">//! # fn find_a_razor() -&gt; Result&lt;u32, u32&gt; { Ok(1) }</span>
<span class="doccomment">//! pub fn shave_the_yak(yak: &amp;Yak) {</span>
<span class="doccomment">//!     info!(target: &quot;yak_events&quot;, &quot;Commencing yak shaving for {:?}&quot;, yak);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     loop {</span>
<span class="doccomment">//!         match find_a_razor() {</span>
<span class="doccomment">//!             Ok(razor) =&gt; {</span>
<span class="doccomment">//!                 info!(&quot;Razor located: {}&quot;, razor);</span>
<span class="doccomment">//!                 yak.shave(razor);</span>
<span class="doccomment">//!                 break;</span>
<span class="doccomment">//!             }</span>
<span class="doccomment">//!             Err(err) =&gt; {</span>
<span class="doccomment">//!                 warn!(&quot;Unable to locate a razor: {}, retrying&quot;, err);</span>
<span class="doccomment">//!             }</span>
<span class="doccomment">//!         }</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## In executables</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Executables should choose a logging framework and initialize it early in the</span>
<span class="doccomment">//! runtime of the program. Logging frameworks will typically include a</span>
<span class="doccomment">//! function to do this. Any log messages generated before the framework is</span>
<span class="doccomment">//! initialized will be ignored.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The executable itself may use the `log` crate to log as well.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Warning</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The logging system may only be initialized once.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust,ignore</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate log;</span>
<span class="doccomment">//! extern crate my_logger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//!     my_logger::init();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     info!(&quot;starting up&quot;);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     // ...</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Logger implementations</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Loggers implement the `Log` trait. Here&#39;s a very basic example that simply</span>
<span class="doccomment">//! logs all messages at the `Error`, `Warn` or `Info` levels to stdout:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate log;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use log::{LogRecord, LogLevel, LogMetadata};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct SimpleLogger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl log::Log for SimpleLogger {</span>
<span class="doccomment">//!     fn enabled(&amp;self, metadata: &amp;LogMetadata) -&gt; bool {</span>
<span class="doccomment">//!         metadata.level() &lt;= LogLevel::Info</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!     fn log(&amp;self, record: &amp;LogRecord) {</span>
<span class="doccomment">//!         if self.enabled(record.metadata()) {</span>
<span class="doccomment">//!             println!(&quot;{} - {}&quot;, record.level(), record.args());</span>
<span class="doccomment">//!         }</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Loggers are installed by calling the `set_logger` function. It takes a</span>
<span class="doccomment">//! closure which is provided a `MaxLogLevel` token and returns a `Log` trait</span>
<span class="doccomment">//! object. The `MaxLogLevel` token controls the global maximum log level. The</span>
<span class="doccomment">//! logging facade uses this as an optimization to improve performance of log</span>
<span class="doccomment">//! messages at levels that are disabled. In the case of our example logger,</span>
<span class="doccomment">//! we&#39;ll want to set the maximum log level to `Info`, since we ignore any</span>
<span class="doccomment">//! `Debug` or `Trace` level log messages. A logging framework should provide a</span>
<span class="doccomment">//! function that wraps a call to `set_logger`, handling initialization of the</span>
<span class="doccomment">//! logger:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # extern crate log;</span>
<span class="doccomment">//! # use log::{LogLevel, LogLevelFilter, SetLoggerError, LogMetadata};</span>
<span class="doccomment">//! # struct SimpleLogger;</span>
<span class="doccomment">//! # impl log::Log for SimpleLogger {</span>
<span class="doccomment">//! #   fn enabled(&amp;self, _: &amp;LogMetadata) -&gt; bool { false }</span>
<span class="doccomment">//! #   fn log(&amp;self, _: &amp;log::LogRecord) {}</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! # #[cfg(feature = &quot;use_std&quot;)]</span>
<span class="doccomment">//! pub fn init() -&gt; Result&lt;(), SetLoggerError&gt; {</span>
<span class="doccomment">//!     log::set_logger(|max_log_level| {</span>
<span class="doccomment">//!         max_log_level.set(LogLevelFilter::Info);</span>
<span class="doccomment">//!         Box::new(SimpleLogger)</span>
<span class="doccomment">//!     })</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Use with `no_std`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! To use the `log` crate without depending on `libstd`, you need to specify</span>
<span class="doccomment">//! `default-features = false` when specifying the dependency in `Cargo.toml`.</span>
<span class="doccomment">//! This makes no difference to libraries using `log` since the logging API</span>
<span class="doccomment">//! remains the same. However executables will need to use the `set_logger_raw`</span>
<span class="doccomment">//! function to initialize a logger and the `shutdown_logger_raw` function to</span>
<span class="doccomment">//! shut down the global logger before exiting:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # extern crate log;</span>
<span class="doccomment">//! # use log::{LogLevel, LogLevelFilter, SetLoggerError, ShutdownLoggerError,</span>
<span class="doccomment">//! #           LogMetadata};</span>
<span class="doccomment">//! # struct SimpleLogger;</span>
<span class="doccomment">//! # impl log::Log for SimpleLogger {</span>
<span class="doccomment">//! #   fn enabled(&amp;self, _: &amp;LogMetadata) -&gt; bool { false }</span>
<span class="doccomment">//! #   fn log(&amp;self, _: &amp;log::LogRecord) {}</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! # impl SimpleLogger {</span>
<span class="doccomment">//! #   fn flush(&amp;self) {}</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! pub fn init() -&gt; Result&lt;(), SetLoggerError&gt; {</span>
<span class="doccomment">//!     unsafe {</span>
<span class="doccomment">//!         log::set_logger_raw(|max_log_level| {</span>
<span class="doccomment">//!             static LOGGER: SimpleLogger = SimpleLogger;</span>
<span class="doccomment">//!             max_log_level.set(LogLevelFilter::Info);</span>
<span class="doccomment">//!             &amp;SimpleLogger</span>
<span class="doccomment">//!         })</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! pub fn shutdown() -&gt; Result&lt;(), ShutdownLoggerError&gt; {</span>
<span class="doccomment">//!     log::shutdown_logger_raw().map(|logger| {</span>
<span class="doccomment">//!         let logger = unsafe { &amp;*(logger as *const SimpleLogger) };</span>
<span class="doccomment">//!         logger.flush();</span>
<span class="doccomment">//!     })</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>

<span class="attribute">#<span class="op">!</span>[<span class="ident">doc</span>(<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">&quot;https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png&quot;</span>,
       <span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">&quot;https://www.rust-lang.org/favicon.ico&quot;</span>,
       <span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">&quot;https://doc.rust-lang.org/log/&quot;</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;nightly&quot;</span>, <span class="ident">feature</span>(<span class="ident">panic_handler</span>))]</span>

<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>), <span class="ident">no_std</span>)]</span>

<span class="comment">// When compiled for the rustc compiler itself we want to make sure that this is</span>
<span class="comment">// an unstable crate</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">rustbuild</span>, <span class="ident">feature</span>(<span class="ident">staged_api</span>, <span class="ident">rustc_private</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">rustbuild</span>, <span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;rustc_private&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;27812&quot;</span>))]</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span> <span class="kw">as</span> <span class="ident">std</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Deref</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">ATOMIC_USIZE_INIT</span>, <span class="ident">Ordering</span>};
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">macros</span>;

<span class="comment">// The setup here is a bit weird to make shutdown_logger_raw work.</span>
<span class="comment">//</span>
<span class="comment">// There are four different states that we care about: the logger&#39;s</span>
<span class="comment">// uninitialized, the logger&#39;s initializing (set_logger&#39;s been called but</span>
<span class="comment">// LOGGER hasn&#39;t actually been set yet), the logger&#39;s active, or the logger is</span>
<span class="comment">// shut down after calling shutdown_logger_raw.</span>
<span class="comment">//</span>
<span class="comment">// The LOGGER static holds a pointer to the global logger. It is protected by</span>
<span class="comment">// the STATE static which determines whether LOGGER has been initialized yet.</span>
<span class="comment">//</span>
<span class="comment">// The shutdown_logger_raw routine needs to make sure that no threads are</span>
<span class="comment">// actively logging before it returns. The number of actively logging threads is</span>
<span class="comment">// tracked in the REFCOUNT static. The routine first sets STATE back to</span>
<span class="comment">// INITIALIZING. All logging calls past that point will immediately return</span>
<span class="comment">// without accessing the logger. At that point, the at_exit routine just waits</span>
<span class="comment">// for the refcount to reach 0 before deallocating the logger. Note that the</span>
<span class="comment">// refcount does not necessarily monotonically decrease at this point, as new</span>
<span class="comment">// log calls still increment and decrement it, but the interval in between is</span>
<span class="comment">// small enough that the wait is really just for the active log calls to finish.</span>

<span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">LOGGER</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Log</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">NopLogger</span>;
<span class="kw">static</span> <span class="ident">STATE</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ATOMIC_USIZE_INIT</span>;
<span class="kw">static</span> <span class="ident">REFCOUNT</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ATOMIC_USIZE_INIT</span>;

<span class="kw">const</span> <span class="ident">INITIALIZING</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">const</span> <span class="ident">INITIALIZED</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">2</span>;

<span class="kw">static</span> <span class="ident">LOG_LEVEL_NAMES</span>: [<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>; <span class="number">6</span>] <span class="op">=</span> [<span class="string">&quot;OFF&quot;</span>, <span class="string">&quot;ERROR&quot;</span>, <span class="string">&quot;WARN&quot;</span>, <span class="string">&quot;INFO&quot;</span>,
                                             <span class="string">&quot;DEBUG&quot;</span>, <span class="string">&quot;TRACE&quot;</span>];

<span class="doccomment">/// An enum representing the available verbosity levels of the logging framework</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A `LogLevel` may be compared directly to a `LogLevelFilter`.</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">usize</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Eq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LogLevel</span> {
    <span class="doccomment">/// The &quot;error&quot; level.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Designates very serious errors.</span>
    <span class="ident">Error</span> <span class="op">=</span> <span class="number">1</span>, <span class="comment">// This way these line up with the discriminants for LogLevelFilter below</span>
    <span class="doccomment">/// The &quot;warn&quot; level.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Designates hazardous situations.</span>
    <span class="ident">Warn</span>,
    <span class="doccomment">/// The &quot;info&quot; level.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Designates useful information.</span>
    <span class="ident">Info</span>,
    <span class="doccomment">/// The &quot;debug&quot; level.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Designates lower priority information.</span>
    <span class="ident">Debug</span>,
    <span class="doccomment">/// The &quot;trace&quot; level.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Designates very low priority, often extremely verbose, information.</span>
    <span class="ident">Trace</span>,
}

<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevel</span> {
        <span class="kw-2">*</span><span class="self">self</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevel</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op">&lt;</span><span class="ident">LogLevelFilter</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevel</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">&gt;</span> {
        <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">cmp</span>(<span class="ident">other</span>))
    }
}

<span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op">&lt;</span><span class="ident">LogLevelFilter</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">&gt;</span> {
        <span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>)))
    }
}

<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevel</span>) <span class="op">-&gt;</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
        (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>))
    }
}

<span class="kw">fn</span> <span class="ident">ok_or</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span>(<span class="ident">t</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">e</span>: <span class="ident">E</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">&gt;</span> {
    <span class="kw">match</span> <span class="ident">t</span> {
        <span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
    }
}

<span class="comment">// Reimplemented here because std::ascii is not available in libcore</span>
<span class="kw">fn</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">a</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">b</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="kw">fn</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">c</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">u8</span> {
        <span class="kw">if</span> <span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">b&#39;a&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">b&#39;z&#39;</span> {
            <span class="ident">c</span> <span class="op">-</span> <span class="string">b&#39;a&#39;</span> <span class="op">+</span> <span class="string">b&#39;A&#39;</span>
        } <span class="kw">else</span> {
            <span class="ident">c</span>
        }
    }

    <span class="kw">if</span> <span class="ident">a</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">b</span>.<span class="ident">len</span>() {
        <span class="ident">a</span>.<span class="ident">bytes</span>()
         .<span class="ident">zip</span>(<span class="ident">b</span>.<span class="ident">bytes</span>())
         .<span class="ident">all</span>(<span class="op">|</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">a</span>) <span class="op">==</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">b</span>))
    } <span class="kw">else</span> {
        <span class="bool-val">false</span>
    }
}

<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> ();
    <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">level</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">LogLevel</span>, ()<span class="op">&gt;</span> {
        <span class="ident">ok_or</span>(<span class="ident">LOG_LEVEL_NAMES</span>.<span class="ident">iter</span>()
                    .<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">name</span><span class="op">|</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">name</span>, <span class="ident">level</span>))
                    .<span class="ident">into_iter</span>()
                    .<span class="ident">filter</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">idx</span><span class="op">|</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span>)
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">idx</span><span class="op">|</span> <span class="ident">LogLevel</span>::<span class="ident">from_usize</span>(<span class="ident">idx</span>).<span class="ident">unwrap</span>())
                    .<span class="ident">next</span>(), ())
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">LogLevel</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="ident">fmt</span>.<span class="ident">pad</span>(<span class="ident">LOG_LEVEL_NAMES</span>[<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>])
    }
}

<span class="kw">impl</span> <span class="ident">LogLevel</span> {
    <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">u</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">LogLevel</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="ident">u</span> {
            <span class="number">1</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span>),
            <span class="number">2</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>),
            <span class="number">3</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>),
            <span class="number">4</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>),
            <span class="number">5</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Trace</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">from_new</span>(<span class="ident">level</span>: <span class="ident">log</span>::<span class="ident">Level</span>) <span class="op">-&gt;</span> <span class="ident">LogLevel</span> {
        <span class="kw">match</span> <span class="ident">level</span> {
            <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Error</span> <span class="op">=&gt;</span> <span class="ident">LogLevel</span>::<span class="ident">Error</span>,
            <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Warn</span> <span class="op">=&gt;</span> <span class="ident">LogLevel</span>::<span class="ident">Warn</span>,
            <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Info</span> <span class="op">=&gt;</span> <span class="ident">LogLevel</span>::<span class="ident">Info</span>,
            <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Debug</span> <span class="op">=&gt;</span> <span class="ident">LogLevel</span>::<span class="ident">Debug</span>,
            <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Trace</span> <span class="op">=&gt;</span> <span class="ident">LogLevel</span>::<span class="ident">Trace</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">to_new</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">LogLevel</span>::<span class="ident">Error</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Error</span>,
            <span class="ident">LogLevel</span>::<span class="ident">Warn</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Warn</span>,
            <span class="ident">LogLevel</span>::<span class="ident">Info</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Info</span>,
            <span class="ident">LogLevel</span>::<span class="ident">Debug</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Debug</span>,
            <span class="ident">LogLevel</span>::<span class="ident">Trace</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">Level</span>::<span class="ident">Trace</span>,
        }
    }

    <span class="doccomment">/// Returns the most verbose logging level.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max</span>() <span class="op">-&gt;</span> <span class="ident">LogLevel</span> {
        <span class="ident">LogLevel</span>::<span class="ident">Trace</span>
    }

    <span class="doccomment">/// Converts the `LogLevel` to the equivalent `LogLevelFilter`.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_log_level_filter</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="ident">LogLevelFilter</span>::<span class="ident">from_usize</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">unwrap</span>()
    }
}

<span class="doccomment">/// An enum representing the available verbosity level filters of the logging</span>
<span class="doccomment">/// framework.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A `LogLevelFilter` may be compared directly to a `LogLevel`.</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">usize</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Eq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LogLevelFilter</span> {
    <span class="doccomment">/// A level lower than all log levels.</span>
    <span class="ident">Off</span>,
    <span class="doccomment">/// Corresponds to the `Error` log level.</span>
    <span class="ident">Error</span>,
    <span class="doccomment">/// Corresponds to the `Warn` log level.</span>
    <span class="ident">Warn</span>,
    <span class="doccomment">/// Corresponds to the `Info` log level.</span>
    <span class="ident">Info</span>,
    <span class="doccomment">/// Corresponds to the `Debug` log level.</span>
    <span class="ident">Debug</span>,
    <span class="doccomment">/// Corresponds to the `Trace` log level.</span>
    <span class="ident">Trace</span>,
}

<span class="comment">// Deriving generates terrible impls of these traits</span>

<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="kw-2">*</span><span class="self">self</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
    }
}

<span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op">&lt;</span><span class="ident">LogLevel</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevel</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="ident">other</span>.<span class="ident">eq</span>(<span class="self">self</span>)
    }
}

<span class="kw">impl</span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">&gt;</span> {
        <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">cmp</span>(<span class="ident">other</span>))
    }
}

<span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op">&lt;</span><span class="ident">LogLevel</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevel</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">&gt;</span> {
        <span class="ident">other</span>.<span class="ident">partial_cmp</span>(<span class="self">self</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">reverse</span>())
    }
}

<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">LogLevelFilter</span>) <span class="op">-&gt;</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
        (<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>))
    }
}

<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> ();
    <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">level</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">LogLevelFilter</span>, ()<span class="op">&gt;</span> {
        <span class="ident">ok_or</span>(<span class="ident">LOG_LEVEL_NAMES</span>.<span class="ident">iter</span>()
                    .<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">name</span><span class="op">|</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">name</span>, <span class="ident">level</span>))
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">LogLevelFilter</span>::<span class="ident">from_usize</span>(<span class="ident">p</span>).<span class="ident">unwrap</span>()), ())
    }
}

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">LogLevelFilter</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmt</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">LOG_LEVEL_NAMES</span>[<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>])
    }
}

<span class="kw">impl</span> <span class="ident">LogLevelFilter</span> {
    <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">u</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">LogLevelFilter</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="ident">u</span> {
            <span class="number">0</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>),
            <span class="number">1</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>),
            <span class="number">2</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>),
            <span class="number">3</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>),
            <span class="number">4</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>),
            <span class="number">5</span> <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">from_new</span>(<span class="ident">filter</span>: <span class="ident">log</span>::<span class="ident">LevelFilter</span>) <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="kw">match</span> <span class="ident">filter</span> {
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Off</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>,
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Error</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>,
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Warn</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>,
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Info</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>,
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Debug</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>,
            <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Trace</span> <span class="op">=&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">to_new</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">LogLevelFilter</span>::<span class="ident">Off</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Off</span>,
            <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Error</span>,
            <span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Warn</span>,
            <span class="ident">LogLevelFilter</span>::<span class="ident">Info</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Info</span>,
            <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Debug</span>,
            <span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span> <span class="op">=&gt;</span> <span class="ident">log</span>::<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>,
        }
    }

    <span class="doccomment">/// Returns the most verbose logging level filter.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max</span>() <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>
    }

    <span class="doccomment">/// Converts `self` to the equivalent `LogLevel`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Returns `None` if `self` is `LogLevelFilter::Off`.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_log_level</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">LogLevel</span><span class="op">&gt;</span> {
        <span class="ident">LogLevel</span>::<span class="ident">from_usize</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>)
    }
}

<span class="doccomment">/// The &quot;payload&quot; of a log message.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LogRecord</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">metadata</span>: <span class="ident">LogMetadata</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
    <span class="ident">location</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">LogLocation</span>,
    <span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">LogRecord</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="doccomment">/// The message body.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">args</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">fmt</span>::<span class="ident">Arguments</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">args</span>
    }

    <span class="doccomment">/// Metadata about the log directive.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">metadata</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">LogMetadata</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">metadata</span>
    }

    <span class="doccomment">/// The location of the log directive.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">location</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">LogLocation</span> {
        <span class="self">self</span>.<span class="ident">location</span>
    }

    <span class="doccomment">/// The verbosity level of the message.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevel</span> {
        <span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">level</span>()
    }

    <span class="doccomment">/// The name of the target of the directive.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">target</span>()
    }
}

<span class="doccomment">/// Metadata about a log message.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LogMetadata</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">level</span>: <span class="ident">LogLevel</span>,
    <span class="ident">target</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">LogMetadata</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="doccomment">/// The verbosity level of the message.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevel</span> {
        <span class="self">self</span>.<span class="ident">level</span>
    }

    <span class="doccomment">/// The name of the target of the directive.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="self">self</span>.<span class="ident">target</span>
    }
}

<span class="doccomment">/// A trait encapsulating the operations required of a logger</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Log</span>: <span class="ident">Sync</span><span class="op">+</span><span class="ident">Send</span> {
    <span class="doccomment">/// Determines if a log message with the specified metadata would be</span>
    <span class="doccomment">/// logged.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This is used by the `log_enabled!` macro to allow callers to avoid</span>
    <span class="doccomment">/// expensive computation of log message arguments if the message would be</span>
    <span class="doccomment">/// discarded anyway.</span>
    <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">metadata</span>: <span class="kw-2">&amp;</span><span class="ident">LogMetadata</span>) <span class="op">-&gt;</span> <span class="ident">bool</span>;

    <span class="doccomment">/// Logs the `LogRecord`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Note that `enabled` is *not* necessarily called before this method.</span>
    <span class="doccomment">/// Implementations of `log` should perform all necessary filtering</span>
    <span class="doccomment">/// internally.</span>
    <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">record</span>: <span class="kw-2">&amp;</span><span class="ident">LogRecord</span>);
}

<span class="comment">// Just used as a dummy initial value for LOGGER</span>
<span class="kw">struct</span> <span class="ident">NopLogger</span>;

<span class="kw">impl</span> <span class="ident">Log</span> <span class="kw">for</span> <span class="ident">NopLogger</span> {
    <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, _: <span class="kw-2">&amp;</span><span class="ident">LogMetadata</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> { <span class="bool-val">false</span> }

    <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, _: <span class="kw-2">&amp;</span><span class="ident">LogRecord</span>) {}
}

<span class="doccomment">/// The location of a log message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Warning</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The fields of this struct are public so that they may be initialized by the</span>
<span class="doccomment">/// `log!` macro. They are subject to change at any time and should never be</span>
<span class="doccomment">/// accessed directly.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LogLocation</span> {
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">__module_path</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">__file</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">__line</span>: <span class="ident">u32</span>,
}

<span class="kw">impl</span> <span class="ident">LogLocation</span> {
    <span class="doccomment">/// The module path of the message.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">module_path</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="self">self</span>.<span class="ident">__module_path</span>
    }

    <span class="doccomment">/// The source file containing the message.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">file</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
        <span class="self">self</span>.<span class="ident">__file</span>
    }

    <span class="doccomment">/// The line containing the message.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">line</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> {
        <span class="self">self</span>.<span class="ident">__line</span>
    }
}

<span class="doccomment">/// A token providing read and write access to the global maximum log level</span>
<span class="doccomment">/// filter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The maximum log level is used as an optimization to avoid evaluating log</span>
<span class="doccomment">/// messages that will be ignored by the logger. Any message with a level</span>
<span class="doccomment">/// higher than the maximum log level filter will be ignored. A logger should</span>
<span class="doccomment">/// make sure to keep the maximum log level filter in sync with its current</span>
<span class="doccomment">/// configuration.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MaxLogLevelFilter</span>(());

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">MaxLogLevelFilter</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmt</span>, <span class="string">&quot;MaxLogLevelFilter&quot;</span>)
    }
}

<span class="kw">impl</span> <span class="ident">MaxLogLevelFilter</span> {
    <span class="doccomment">/// Gets the current maximum log level filter.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
        <span class="ident">max_log_level</span>()
    }

    <span class="doccomment">/// Sets the maximum log level.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">level</span>: <span class="ident">LogLevelFilter</span>) {
        <span class="ident">log</span>::<span class="ident">set_max_level</span>(<span class="ident">level</span>.<span class="ident">to_new</span>())
    }
}

<span class="doccomment">/// Returns the current maximum log level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `log!`, `error!`, `warn!`, `info!`, `debug!`, and `trace!` macros check</span>
<span class="doccomment">/// this value and discard any message logged at a higher level. The maximum</span>
<span class="doccomment">/// log level is set by the `MaxLogLevel` token passed to loggers.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_log_level</span>() <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
    <span class="ident">LogLevelFilter</span>::<span class="ident">from_new</span>(<span class="ident">log</span>::<span class="ident">max_level</span>())
}

<span class="doccomment">/// Sets the global logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `make_logger` closure is passed a `MaxLogLevel` object, which the</span>
<span class="doccomment">/// logger should use to keep the global maximum log level in sync with the</span>
<span class="doccomment">/// highest log level that the logger will not ignore.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may only be called once in the lifetime of a program. Any log</span>
<span class="doccomment">/// events that occur before the call to `set_logger` completes will be</span>
<span class="doccomment">/// ignored.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function does not typically need to be called manually. Logger</span>
<span class="doccomment">/// implementations should provide an initialization method that calls</span>
<span class="doccomment">/// `set_logger` internally.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `use_std` feature (enabled by default).</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_logger</span><span class="op">&lt;</span><span class="ident">M</span><span class="op">&gt;</span>(<span class="ident">make_logger</span>: <span class="ident">M</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">SetLoggerError</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">M</span>: <span class="ident">FnOnce</span>(<span class="ident">MaxLogLevelFilter</span>) <span class="op">-&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Log</span><span class="op">&gt;</span> {
    <span class="kw">unsafe</span> { <span class="ident">set_logger_raw</span>(<span class="op">|</span><span class="ident">max_level</span><span class="op">|</span> <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">make_logger</span>(<span class="ident">max_level</span>))) }
}

<span class="doccomment">/// Sets the global logger from a raw pointer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is similar to `set_logger` except that it is usable in</span>
<span class="doccomment">/// `no_std` code.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `make_logger` closure is passed a `MaxLogLevel` object, which the</span>
<span class="doccomment">/// logger should use to keep the global maximum log level in sync with the</span>
<span class="doccomment">/// highest log level that the logger will not ignore.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may only be called once in the lifetime of a program. Any log</span>
<span class="doccomment">/// events that occur before the call to `set_logger_raw` completes will be</span>
<span class="doccomment">/// ignored.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function does not typically need to be called manually. Logger</span>
<span class="doccomment">/// implementations should provide an initialization method that calls</span>
<span class="doccomment">/// `set_logger_raw` internally.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer returned by `make_logger` must remain valid for the entire</span>
<span class="doccomment">/// duration of the program or until `shutdown_logger_raw` is called. In</span>
<span class="doccomment">/// addition, `shutdown_logger` *must not* be called after this function.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">set_logger_raw</span><span class="op">&lt;</span><span class="ident">M</span><span class="op">&gt;</span>(<span class="ident">make_logger</span>: <span class="ident">M</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">SetLoggerError</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">M</span>: <span class="ident">FnOnce</span>(<span class="ident">MaxLogLevelFilter</span>) <span class="op">-&gt;</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Log</span> {
    <span class="kw">static</span> <span class="ident">ADAPTOR</span>: <span class="ident">LoggerAdaptor</span> <span class="op">=</span> <span class="ident">LoggerAdaptor</span>;
    <span class="kw">match</span> <span class="ident">log</span>::<span class="ident">set_logger</span>(<span class="kw-2">&amp;</span><span class="ident">ADAPTOR</span>) {
        <span class="prelude-val">Ok</span>(()) <span class="op">=&gt;</span> {
            <span class="ident">LOGGER</span> <span class="op">=</span> <span class="ident">make_logger</span>(<span class="ident">MaxLogLevelFilter</span>(()));
            <span class="ident">STATE</span>.<span class="ident">store</span>(<span class="ident">INITIALIZED</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
            <span class="prelude-val">Ok</span>(())
        }
        <span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">SetLoggerError</span>(())),
    }
}

<span class="doccomment">/// Shuts down the global logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may only be called once in the lifetime of a program, and may</span>
<span class="doccomment">/// not be called before `set_logger`. Once the global logger has been shut</span>
<span class="doccomment">/// down, it can no longer be re-initialized by `set_logger`. Any log events</span>
<span class="doccomment">/// that occur after the call to `shutdown_logger` completes will be ignored.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The logger that was originally created by the call to to `set_logger` is</span>
<span class="doccomment">/// returned on success. At that point it is guaranteed that no other threads</span>
<span class="doccomment">/// are concurrently accessing the logger object.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shutdown_logger</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">Log</span><span class="op">&gt;</span>, <span class="ident">ShutdownLoggerError</span><span class="op">&gt;</span> {
    <span class="ident">shutdown_logger_raw</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">l</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">l</span>) })
}

<span class="doccomment">/// Shuts down the global logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is similar to `shutdown_logger` except that it is usable in</span>
<span class="doccomment">/// `no_std` code.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may only be called once in the lifetime of a program, and may</span>
<span class="doccomment">/// not be called before `set_logger_raw`. Once the global logger has been shut</span>
<span class="doccomment">/// down, it can no longer be re-initialized by `set_logger_raw`. Any log</span>
<span class="doccomment">/// events that occur after the call to `shutdown_logger_raw` completes will be</span>
<span class="doccomment">/// ignored.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The pointer that was originally passed to `set_logger_raw` is returned on</span>
<span class="doccomment">/// success. At that point it is guaranteed that no other threads are</span>
<span class="doccomment">/// concurrently accessing the logger object.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shutdown_logger_raw</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Log</span>, <span class="ident">ShutdownLoggerError</span><span class="op">&gt;</span> {
    <span class="comment">// Set to INITIALIZING to prevent re-initialization after</span>
    <span class="kw">if</span> <span class="ident">STATE</span>.<span class="ident">compare_and_swap</span>(<span class="ident">INITIALIZED</span>, <span class="ident">INITIALIZING</span>,
                              <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) <span class="op">!=</span> <span class="ident">INITIALIZED</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ShutdownLoggerError</span>(()));
    }

    <span class="kw">while</span> <span class="ident">REFCOUNT</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) <span class="op">!=</span> <span class="number">0</span> {
        <span class="comment">// FIXME add a sleep here when it doesn&#39;t involve timers</span>
    }

    <span class="kw">unsafe</span> {
        <span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="ident">LOGGER</span>;
        <span class="ident">LOGGER</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="ident">NopLogger</span>;
        <span class="prelude-val">Ok</span>(<span class="ident">logger</span>)
    }
}

<span class="doccomment">/// The type returned by `set_logger` if `set_logger` has already been called.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_copy_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SetLoggerError</span>(());

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">SetLoggerError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmt</span>, <span class="string">&quot;attempted to set a logger after the logging system \
                     was already initialized&quot;</span>)
    }
}

<span class="comment">// The Error trait is not available in libcore</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">SetLoggerError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> { <span class="string">&quot;set_logger() called multiple times&quot;</span> }
}

<span class="doccomment">/// The type returned by `shutdown_logger_raw` if `shutdown_logger_raw` has</span>
<span class="doccomment">/// already been called or if `set_logger_raw` has not been called yet.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_copy_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ShutdownLoggerError</span>(());

<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ShutdownLoggerError</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
        <span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmt</span>, <span class="string">&quot;attempted to shut down the logger without an active logger&quot;</span>)
    }
}

<span class="comment">// The Error trait is not available in libcore</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">ShutdownLoggerError</span> {
    <span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> { <span class="string">&quot;shutdown_logger() called without an active logger&quot;</span> }
}

<span class="doccomment">/// Deprecated</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Use https://crates.io/crates/log-panics instead.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;nightly&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>))]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log_panics</span>() {
    <span class="ident">std</span>::<span class="ident">panic</span>::<span class="ident">set_hook</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">panic</span>::<span class="ident">log</span>));
}

<span class="comment">// inner module so that the reporting module is log::panic instead of log</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;nightly&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>))]</span>
<span class="kw">mod</span> <span class="ident">panic</span> {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">panic</span>::<span class="ident">PanicInfo</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">log</span>(<span class="ident">info</span>: <span class="kw-2">&amp;</span><span class="ident">PanicInfo</span>) {
        <span class="kw">let</span> <span class="ident">thread</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">current</span>();
        <span class="kw">let</span> <span class="ident">thread</span> <span class="op">=</span> <span class="ident">thread</span>.<span class="ident">name</span>().<span class="ident">unwrap_or</span>(<span class="string">&quot;&lt;unnamed&gt;&quot;</span>);

        <span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">info</span>.<span class="ident">payload</span>().<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span><span class="op">&gt;</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="kw-2">*</span><span class="ident">s</span>,
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="ident">info</span>.<span class="ident">payload</span>().<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
                <span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=&gt;</span> <span class="kw-2">&amp;</span><span class="ident">s</span>[..],
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="string">&quot;Box&lt;Any&gt;&quot;</span>,
            }
        };

        <span class="kw">match</span> <span class="ident">info</span>.<span class="ident">location</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">location</span>) <span class="op">=&gt;</span> {
                <span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;thread &#39;{}&#39; panicked at &#39;{}&#39;: {}:{}&quot;</span>,
                       <span class="ident">thread</span>,
                       <span class="ident">msg</span>,
                       <span class="ident">location</span>.<span class="ident">file</span>(),
                       <span class="ident">location</span>.<span class="ident">line</span>())
            }
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;thread &#39;{}&#39; panicked at &#39;{}&#39;&quot;</span>, <span class="ident">thread</span>, <span class="ident">msg</span>),
        }
    }
}

<span class="kw">struct</span> <span class="ident">LoggerGuard</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">Log</span>);

<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">LoggerGuard</span> {
    <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="ident">REFCOUNT</span>.<span class="ident">fetch_sub</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
    }
}

<span class="kw">impl</span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">LoggerGuard</span> {
    <span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">Log</span>;

    <span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>(<span class="ident">Log</span> <span class="op">+</span> <span class="lifetime">&#39;static</span>) {
        <span class="self">self</span>.<span class="number">0</span>
    }
}

<span class="kw">fn</span> <span class="ident">logger</span>() <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">LoggerGuard</span><span class="op">&gt;</span> {
    <span class="ident">REFCOUNT</span>.<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
    <span class="kw">if</span> <span class="ident">STATE</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) <span class="op">!=</span> <span class="ident">INITIALIZED</span> {
        <span class="ident">REFCOUNT</span>.<span class="ident">fetch_sub</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
        <span class="prelude-val">None</span>
    } <span class="kw">else</span> {
        <span class="prelude-val">Some</span>(<span class="ident">LoggerGuard</span>(<span class="kw">unsafe</span> { <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">LOGGER</span> }))
    }
}

<span class="kw">struct</span> <span class="ident">LoggerAdaptor</span>;

<span class="kw">impl</span> <span class="ident">log</span>::<span class="ident">Log</span> <span class="kw">for</span> <span class="ident">LoggerAdaptor</span> {
    <span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">record</span>: <span class="kw-2">&amp;</span><span class="ident">log</span>::<span class="ident">Record</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">logger</span>) <span class="op">=</span> <span class="ident">logger</span>() {
            <span class="kw">let</span> <span class="ident">record</span> <span class="op">=</span> <span class="ident">LogRecord</span> {
                <span class="ident">metadata</span>: <span class="ident">LogMetadata</span> {
                    <span class="ident">level</span>: <span class="ident">LogLevel</span>::<span class="ident">from_new</span>(<span class="ident">record</span>.<span class="ident">level</span>()),
                    <span class="ident">target</span>: <span class="ident">record</span>.<span class="ident">target</span>(),
                },
                <span class="comment">// file and module path aren&#39;t static in 0.4 so we can&#39;t forward them.</span>
                <span class="ident">location</span>: <span class="kw-2">&amp;</span><span class="ident">LogLocation</span> {
                    <span class="ident">__file</span>: <span class="string">&quot;&lt;unknown&gt;&quot;</span>,
                    <span class="ident">__line</span>: <span class="ident">record</span>.<span class="ident">line</span>().<span class="ident">unwrap_or</span>(<span class="number">0</span>),
                    <span class="ident">__module_path</span>: <span class="string">&quot;&lt;unknown&gt;&quot;</span>,
                },
                <span class="ident">args</span>: <span class="kw-2">*</span><span class="ident">record</span>.<span class="ident">args</span>(),
            };
            <span class="ident">logger</span>.<span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="ident">record</span>);
        }
    }

    <span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">metadata</span>: <span class="kw-2">&amp;</span><span class="ident">log</span>::<span class="ident">Metadata</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="ident">logger</span>() {
            <span class="prelude-val">Some</span>(<span class="ident">logger</span>) <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">LogMetadata</span> {
                    <span class="ident">level</span>: <span class="ident">LogLevel</span>::<span class="ident">from_new</span>(<span class="ident">metadata</span>.<span class="ident">level</span>()),
                    <span class="ident">target</span>: <span class="ident">metadata</span>.<span class="ident">target</span>(),
                };
                <span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="ident">metadata</span>)
            }
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="bool-val">false</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {}
}

<span class="comment">// WARNING</span>
<span class="comment">// This is not considered part of the crate&#39;s public API. It is subject to</span>
<span class="comment">// change at any time.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__enabled</span>(<span class="ident">level</span>: <span class="ident">LogLevel</span>, <span class="ident">target</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="kw">match</span> <span class="ident">logger</span>() {
        <span class="prelude-val">Some</span>(<span class="ident">logger</span>) <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">LogMetadata</span> {
                <span class="ident">level</span>: <span class="ident">level</span>,
                <span class="ident">target</span>: <span class="ident">target</span>,
            };
            <span class="ident">logger</span>.<span class="ident">enabled</span>(<span class="kw-2">&amp;</span><span class="ident">metadata</span>)
        }
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
            <span class="ident">log</span>::<span class="ident">Log</span>::<span class="ident">enabled</span>(
                <span class="ident">log</span>::<span class="ident">logger</span>(),
                <span class="kw-2">&amp;</span><span class="ident">log</span>::<span class="ident">Metadata</span>::<span class="ident">builder</span>()
                    .<span class="ident">level</span>(<span class="ident">level</span>.<span class="ident">to_new</span>())
                    .<span class="ident">target</span>(<span class="ident">target</span>)
                    .<span class="ident">build</span>()
            )
        }
    }
}

<span class="comment">// WARNING</span>
<span class="comment">// This is not considered part of the crate&#39;s public API. It is subject to</span>
<span class="comment">// change at any time.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__log</span>(<span class="ident">level</span>: <span class="ident">LogLevel</span>, <span class="ident">target</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">loc</span>: <span class="kw-2">&amp;</span><span class="ident">LogLocation</span>,
             <span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) {
    <span class="kw">match</span> <span class="ident">logger</span>() {
        <span class="prelude-val">Some</span>(<span class="ident">logger</span>) <span class="op">=&gt;</span> {
            <span class="kw">let</span> <span class="ident">record</span> <span class="op">=</span> <span class="ident">LogRecord</span> {
                <span class="ident">metadata</span>: <span class="ident">LogMetadata</span> {
                    <span class="ident">level</span>: <span class="ident">level</span>,
                    <span class="ident">target</span>: <span class="ident">target</span>,
                },
                <span class="ident">location</span>: <span class="ident">loc</span>,
                <span class="ident">args</span>: <span class="ident">args</span>,
            };
            <span class="ident">logger</span>.<span class="ident">log</span>(<span class="kw-2">&amp;</span><span class="ident">record</span>);
        }
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
            <span class="ident">log</span>::<span class="ident">Log</span>::<span class="ident">log</span>(
                <span class="ident">log</span>::<span class="ident">logger</span>(),
                <span class="kw-2">&amp;</span><span class="ident">log</span>::<span class="ident">Record</span>::<span class="ident">builder</span>()
                    .<span class="ident">level</span>(<span class="ident">level</span>.<span class="ident">to_new</span>())
                    .<span class="ident">target</span>(<span class="ident">target</span>)
                    .<span class="ident">file</span>(<span class="prelude-val">Some</span>(<span class="ident">loc</span>.<span class="ident">__file</span>))
                    .<span class="ident">line</span>(<span class="prelude-val">Some</span>(<span class="ident">loc</span>.<span class="ident">__line</span>))
                    .<span class="ident">module_path</span>(<span class="prelude-val">Some</span>(<span class="ident">loc</span>.<span class="ident">__module_path</span>))
                    .<span class="ident">args</span>(<span class="ident">args</span>)
                    .<span class="ident">build</span>()
            )
        }
    }
}

<span class="comment">// WARNING</span>
<span class="comment">// This is not considered part of the crate&#39;s public API. It is subject to</span>
<span class="comment">// change at any time.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__static_max_level</span>() <span class="op">-&gt;</span> <span class="ident">LogLevelFilter</span> {
    <span class="ident">LogLevelFilter</span>::<span class="ident">from_new</span>(<span class="ident">log</span>::<span class="ident">STATIC_MAX_LEVEL</span>)
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
     <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
     <span class="kw">use</span> <span class="ident">tests</span>::<span class="ident">std</span>::<span class="ident">string</span>::<span class="ident">ToString</span>;
     <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">LogLevel</span>, <span class="ident">LogLevelFilter</span>};

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_loglevelfilter_from_str</span>() {
         <span class="kw">let</span> <span class="ident">tests</span> <span class="op">=</span> [
             (<span class="string">&quot;off&quot;</span>,   <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>)),
             (<span class="string">&quot;error&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>)),
             (<span class="string">&quot;warn&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>)),
             (<span class="string">&quot;info&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>)),
             (<span class="string">&quot;debug&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>)),
             (<span class="string">&quot;trace&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>)),
             (<span class="string">&quot;OFF&quot;</span>,   <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>)),
             (<span class="string">&quot;ERROR&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>)),
             (<span class="string">&quot;WARN&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span>)),
             (<span class="string">&quot;INFO&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>)),
             (<span class="string">&quot;DEBUG&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>)),
             (<span class="string">&quot;TRACE&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>)),
             (<span class="string">&quot;asdf&quot;</span>,  <span class="prelude-val">Err</span>(())),
         ];
         <span class="kw">for</span> <span class="kw-2">&amp;</span>(<span class="ident">s</span>, <span class="kw-2">ref</span> <span class="ident">expected</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">tests</span> {
             <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span>, <span class="kw-2">&amp;</span><span class="ident">s</span>.<span class="ident">parse</span>());
         }
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_loglevel_from_str</span>() {
         <span class="kw">let</span> <span class="ident">tests</span> <span class="op">=</span> [
             (<span class="string">&quot;OFF&quot;</span>,   <span class="prelude-val">Err</span>(())),
             (<span class="string">&quot;error&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span>)),
             (<span class="string">&quot;warn&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>)),
             (<span class="string">&quot;info&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>)),
             (<span class="string">&quot;debug&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>)),
             (<span class="string">&quot;trace&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Trace</span>)),
             (<span class="string">&quot;ERROR&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span>)),
             (<span class="string">&quot;WARN&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Warn</span>)),
             (<span class="string">&quot;INFO&quot;</span>,  <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Info</span>)),
             (<span class="string">&quot;DEBUG&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>)),
             (<span class="string">&quot;TRACE&quot;</span>, <span class="prelude-val">Ok</span>(<span class="ident">LogLevel</span>::<span class="ident">Trace</span>)),
             (<span class="string">&quot;asdf&quot;</span>,  <span class="prelude-val">Err</span>(())),
         ];
         <span class="kw">for</span> <span class="kw-2">&amp;</span>(<span class="ident">s</span>, <span class="kw-2">ref</span> <span class="ident">expected</span>) <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="ident">tests</span> {
             <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span>, <span class="kw-2">&amp;</span><span class="ident">s</span>.<span class="ident">parse</span>());
         }
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_loglevel_show</span>() {
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;INFO&quot;</span>, <span class="ident">LogLevel</span>::<span class="ident">Info</span>.<span class="ident">to_string</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ERROR&quot;</span>, <span class="ident">LogLevel</span>::<span class="ident">Error</span>.<span class="ident">to_string</span>());
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_loglevelfilter_show</span>() {
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;OFF&quot;</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>.<span class="ident">to_string</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;ERROR&quot;</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>.<span class="ident">to_string</span>());
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_cross_cmp</span>() {
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span> <span class="op">&gt;</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>);
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Warn</span> <span class="op">&lt;</span> <span class="ident">LogLevel</span>::<span class="ident">Trace</span>);
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span> <span class="op">&lt;</span> <span class="ident">LogLevel</span>::<span class="ident">Error</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_cross_eq</span>() {
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span> <span class="op">==</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>);
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Off</span> <span class="op">!=</span> <span class="ident">LogLevel</span>::<span class="ident">Error</span>);
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LogLevel</span>::<span class="ident">Trace</span> <span class="op">==</span> <span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_to_log_level</span>() {
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Error</span>), <span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>.<span class="ident">to_log_level</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">LogLevelFilter</span>::<span class="ident">Off</span>.<span class="ident">to_log_level</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="ident">LogLevel</span>::<span class="ident">Debug</span>), <span class="ident">LogLevelFilter</span>::<span class="ident">Debug</span>.<span class="ident">to_log_level</span>());
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">test_to_log_level_filter</span>() {
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Error</span>, <span class="ident">LogLevel</span>::<span class="ident">Error</span>.<span class="ident">to_log_level_filter</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Trace</span>, <span class="ident">LogLevel</span>::<span class="ident">Trace</span>.<span class="ident">to_log_level_filter</span>());
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;use_std&quot;</span>)]</span>
     <span class="kw">fn</span> <span class="ident">test_error_trait</span>() {
         <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
         <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">SetLoggerError</span>;
         <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">SetLoggerError</span>(());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">e</span>.<span class="ident">description</span>(), <span class="string">&quot;set_logger() called multiple times&quot;</span>);
     }
}
</pre>
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